Measuring syringe



YPatented dan. 3, 1928.

UNITED STATI-:S APixiENT OFFICE.

FREDERICK A. VOOS, OF NEVARK, YNEWI JERSEY, ASSIGNOR TO WESTERN ELECTRIC COMPANY, INCORPORATED, F NEW YORK, N. Y., A lCORPORATION 0F NEW YORK.

^ `iirEAsU'nINe staunen'.V .y

Appiiation. fried August le, 1923. 'serial imessos.

1 This invention relates'to nozzles and more particularly toV nozzles v'suitable for use on' syringes and .similar articles. 4

ling the kamount to beejected. e A feature of the invention is the provision of a measuring nozzle for a fluid coiitainer.

A further feature of the invention lies in the use of a needle valveto control the quantity of fluid ejected by the nozzle.

A still further feature liesr in the means for operating'the needle valve under pressure to eject fluid from the nozzle.

A' These and other features of the invention will be apparent from a consideration of the accompanying drawing and'description together with the appended claims.

1n the drawing, Fig. 1 shows a general view of a syringe equipped with the nozzle thel invention. 2 shows an enlarged view of the nozzle with a skeleton showing of the needle valve. Fig. 3 shows a crossvsection of the nozzle with the piston ofthe.

valve in position for ejection of fluid. Fig. t shows a'portion of Aar modiedforin ofthe valve.Y .e

The nozzle consists of a short straight tube 1 wliichdecreases rather abruptly to a` tapering section 3.

The straight section is equipped with an interior screw thread 11 for attachment to the syringe 5 and carries an integral knurled ring 2 which serves for a grip in screwing the nozzleon to the syringe. Between the screw threads and the tapering tube is a cylindrical chamber fi. The tapered tube hasv its bore made up of seiferal straight sections of successively smaller diameter forming` shoulders such. as 7 and 8. y

1n this tube is placed a tapering rod or needle l) provided with a cylindrical head 10.V This 'head moves freely in the chamber 5 but is large enough to Cover the opening 11 at the larger end of tube 8 and also'to close the opening 12 in the threaded end ofthe syringe 5. The needle is so tapered-that when in its extreme forward position, as shown in Fig. 2, it closes the tube at the shoulder 8 acting as a valve to prevent any contents of the nozzle from escaping.

il; modification of thenozzle is shown in ,F In this case the tube 20 has a unifor'iiilyftapered bore while the needle `is straight for the ,greater partA of its' length, but has a taper, somewhat greater than that ofthe tube, near the tip, forming anangle orl'shouldei 22,."This` shoulder seats ragainst v'the innersurface of 'thetiibe and acts as` the Vvalve in thisform of the invention.

rThe pu'rposerof the various features of the nozzle vwill be more clearly understood 'from a description of thenlethod of opera-1 tion."v The syringe itself may be of any well known type having a threaded outlet such as 18. The piston is slipped inside'the tube and the nozzle screwed on to the syringe, a gasket 13 being provided to makeV a fluid tight joint.' y

The syringe having beenfilled with the vfluid to be used, pressure islapplied to the main piston 14 by means of the rings 15. The .pressure on the fluid will lbe transmitted to the head which will be forced forward 1 and the shaft seated on the shoulder 8v as vshown Vin Fig. 2. Still maintaining the pressure on' piston 14, the tip y16 of the needle 9 Vis thenplaced against'the surface,such,as 17, to which the fluid is to be applied and the needle forced back into the tube. This action: brings the needle head `10 against the threaded outlet 18 of ythe syringe closing the` opening therein. At the Sametime, the lluidewhich, under the pressure onpston 14," has filled the chamber 6 andthe tube 3 as far as the shoulder, is vforced around the head10 and the needle 9 out on the surface 17.

It has been' found that this arrangement affords a method for applying definite small amounts of fluid to a surface, varying with the pressure applied to` .the'rings 15. The

pressure applied to the piston 14 by means g of the rings is transmitted to the fluid in the chamber 6 and through it to the walls of the chamber and the head 10 of the needle 9. As soon as the tip 1G is applied to a sur face and the head 10 is lifted yfrom 'the opening 11, the pressure on the fluid gives tothe fluid a velocityv varyingwith suchpress'ure. Thetimeconsumed by the needle in moving from 'its forward to its rearwardposition it moves from chamber Sinto the tube 3 and .the fluid the greater the velocity with'whch f Y the greater' the quantity of liquid ejected. Thus by varying the pressure applied to the rings l5 the quantity of fluid forced out of the syringe` lmay be very closely controlled and once the .desired pressure has been determined a uniform quantity of fluid can be ejected at each application of the syringe.

As soon as the nozzle is removed from surface 17.7, the pressure on the rings 15 and the piston ll will cause the needle 9V toreturn 1'to forward position asshown in Fig. 2. y

The nozzle which forinsthe subject of this invention, was developed for the purpose of applying a small but controllable quantity of lubricant directly to the surface to be lubricated. y However, modifications to adapt the nozzle 'for surface applications of other` fluids are obvious and the claims have not been limited to a lubricating device.

that is claimed is: I

l.V A nozzle comprising an inlet tube, a cylindrical chamber, aiiroutlet tube, interior shoulders in said outlet tube, a piston comprising a head and a shaft, said head movably hield in said Chamber, said shaft so tapered as toseat Von one or more of said slioul-r other position of said lpiston to close the out-p let of'said syringe, a portion of said shaft projecting vbeyond said nozzle by means of which said piston is moved from said firstposition to said secondV position.

3. The combination of a syringe, a nozzle for said syringe and a valve in said: nozzle comprising shoulders on the interior of said nozzle, anda needle seated on one or more ofsaid shoulders to close said nozzle, and projeeting beyond the tip of the nozzle, Where'- by the applicationk ofrsaid nozzle to a surface opens said valve. n

4.. The combination of a syringe, a nozzle for said syringe and a valve in said nozzle comprising shoulders on the linner surface of saidnozzle, a needle seated on said Ishouldei-sto close said nozzle and projecting'beyond the tip of the nozzle, a head on said needle, the project-ion of said'needle serving closing'said outlet and forcing a small quan-V tity'of liquid out of said nozzle When applied to a surface.

(S. ln a Huid applicator, a reservoir, a measuring chamber, means to force Huid under pressure from said reservoir into said measuring chamber, means to simultaneously prevent further flow from said reservoir to said measuring chamber and' to ieleasefthe iiuid 4from said measuring chamber, said fluid being ikzleased under a pressure which is a function of the pressure usedto force fluid into 'said measuring chamber.

In Witness whereof, I hereunto subscribe my :naine this 2 yday of August, A. D., 1923.

FREDERICK A. VOOS. 

